https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78285
Bug ID: 78285
Summary: error on duplicate switch label where a note should be
Product: gcc
Version: 7.0
Status: UNCONFIRMED
Severity: minor
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: msebor at gcc dot gnu.org
Target Milestone: ---
GCC normally issues a single error or warning message for a constraint
violation that is then sometimes followed by a note with additional context.
In the case of an error for a duplicated case label in a switch statement,
however, GCC issues at least two errors: one for each of duplicates and one for
the original. The test case below shows this inconsistency. The duplicate
label error should be changed into a not for consistency.
$ cat z.c && gcc -S -Wall -Wextra z.c
void f (void)
{
switch (0) {
case 0: ;
case 0: ;
case 0: ;
}
}
void f (int);
z.c: In function ‘f’:
z.c:5:3: error: duplicate case value
case 0: ;
^~~~
z.c:4:3: error: previously used here
case 0: ;
^~~~
z.c:6:3: error: duplicate case value
case 0: ;
^~~~
z.c:4:3: error: previously used here
case 0: ;
^~~~
z.c: At top level:
z.c:10:6: error: conflicting types for ‘f’
void f (int);
^
z.c:1:6: note: previous definition of ‘f’ was here
void f (void)
^
